I have social engine installed on http://oops.healthtrainingasia.com/ I want to created a native app using Ionic framework, which has push notification enabled. Please let me know is it possible? if yes, then what is the way to it? Any tutorial, guide etc,

I have no idea about Oxwall, and so it seems nobody else has here, but:

If it has an API, you can build an Ionic app that consumes this API (REST, JSON, something like that) to get and write data. If you want to trigger push notifications you will have to have some code, that calls a push API when the stuff happens that should trigger a push notification.